Pith Number

pith:CQ4W2S66

pith:1998:CQ4W2S66XDDUDBZTARFUNBIUBP

not attested not anchored not stored refs pending

Ultrametric Distance in Syntax

Mark D. Roberts

arxiv:cs/9810012 v4 · 1998-10-13 · cs.CL · q-bio.NC

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CQ4W2S66XDDUDBZTARFUNBIUBP}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T01:25:18.663488Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

14396d4bdeb8c7418733044b4685140bd16265a9c4761656aaef80d65edf8fbd

Aliases

arxiv: cs/9810012 · arxiv_version: cs/9810012v4 · doi: 10.48550/arxiv.cs/9810012 · pith_short_12: CQ4W2S66XDDU · pith_short_16: CQ4W2S66XDDUDBZT · pith_short_8: CQ4W2S66

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/CQ4W2S66XDDUDBZTARFUNBIUBP \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 14396d4bdeb8c7418733044b4685140bd16265a9c4761656aaef80d65edf8fbd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1cdcfadd943cd9f90f519472d98c878587fba74d26f6d20fce1deccd1facbeed",
    "cross_cats_sorted": [
      "q-bio.NC"
    ],
    "license": "",
    "primary_cat": "cs.CL",
    "submitted_at": "1998-10-13T10:24:56Z",
    "title_canon_sha256": "550929775b77f4a94410f9f012970ee1e96f653260807342d3a85f9aed99579b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "cs/9810012",
    "kind": "arxiv",
    "version": 4
  }
}